# Mechanical Springs - Mechanical Engineering (MCQ) questions and answers

1)   What is the Wahl's factor if spring index is 6?

a. 1.477
b. 0.995
c. 1.252
d. None of the above
 Answer  Explanation ANSWER: 1.252 Explanation: No explanation is available for this question!

2)   Determine number of coils in a helical compression spring, if modulus of rigidity is 80 Gpa and spring stiffness is 50 N/ mm. Assume wire diameter and spring index as 8 mm and 5 respectively

a. 11.8 turns
b. 12.8 turns
c. 13.3 turns
d. None of the above
 Answer  Explanation ANSWER: 12.8 turns Explanation: No explanation is available for this question!

3)   Free length for helical compression springs having square ends is given as ________.

a. pn + 2d
b. pn + 3d
c. 2(p + d)
d. pn + 4d
 Answer  Explanation ANSWER: pn + 3d Explanation: No explanation is available for this question!

4)   Why are mechanical springs used?

a. To apply force
b. To store energy
c. To measure force
d. All of the above
 Answer  Explanation ANSWER: All of the above Explanation: No explanation is available for this question!

5)   Which of the following statements is/are true?

1. In volute springs, number of active coils gradually decreases as load increases
2. Stiffness of spring decreases as number of coils decreases in conical springs
3. Torsion springs are generally spiral
4. Helical torsion springs are used in automobile starters

a. Statements 1 and 3
b. Statements 2, 3 and 4
c. Statements 1, 3 and 4
d. All of the above
 Answer  Explanation ANSWER: Statements 1, 3 and 4 Explanation: No explanation is available for this question!

6)   In which condition the axial distance between two adjacent coils is called as pitch?

a. Compressed condition
b. Uncompressed condition
c. Both a. and b.
d. None of the above
 Answer  Explanation ANSWER: Uncompressed condition Explanation: No explanation is available for this question!

7)   Solid length for helical compression springs having square and ground ends is given as _________.

a. (n + 2)d
b. (n + 3)d
c. (n + 1)d
d. None of the above
 Answer  Explanation ANSWER: (n + 2)d Explanation: No explanation is available for this question!

8)   Which type of springs have only active coils?

a. Helical compression springs
b. Helical tension springs
c. Both a. and b.
d. None of the above
 Answer  Explanation ANSWER: Helical tension springs Explanation: No explanation is available for this question!

9)   The shear stress concentration factor (Ks) in mechanical springs is given as _____

a. (1 + 0.5 / C)
b. 0.615 / C
c. (1 + 0.615 / C)
d. [(4C – 1) / (4C + 1)] + [0.615 / C]
 Answer  Explanation ANSWER: (1 + 0.5 / C) Explanation: No explanation is available for this question!

10)   Which factor is used to consider the effects of direct shear stress and torsional shear stress when curvature effect stress is not considered?

a. Shear stress concentration factor
b. Wahl shear stress concentration factor
c. Both a. and b.
d. None of the above
 Answer  Explanation ANSWER: Shear stress concentration factor Explanation: No explanation is available for this question!